Article
Chemistry, Physical
Jiaqi Liu, Yannan Dong, Zhengqu Zhu, Huan Zhao, Jing Pang, Pu Wang, Jiaquan Zhang
Summary: FeSiBCCr amorphous powders were produced by a novel gas-water combined atomization process, and the magnetic powder cores (MPCs) fabricated from these powders exhibited high circularity, excellent thermal stability, and high saturation magnetization. The study explored the effects of phosphating treatment, cold pressing, and annealing on the properties of the MPCs, and determined the optimal conditions for achieving high permeability, low core loss, and high DC-bias% values.
Article
Materials Science, Multidisciplinary
Shuwang Ma, Zheng Lv, Jian Wang, Haicheng Wang, Jian Yang, Zhimin Yang, Jingli Li, Zhiyong Xue
Summary: This study systematically investigated the effects of master alloy composition and annealing temperature on the amorphization and crystallization behavior of Fe-W-B powders. The results showed that master alloys with high content of W and B yielded amorphous Fe-W-B powders, which exhibited superior shielding performance for gamma-rays and neutrons compared to iron.
Article
Chemistry, Physical
Tongchun Zhao, Cunguang Chen, XiaoJie Wu, Chenzeng Zhang, Alex A. Volinsky, Junjie Hao
Summary: Amorphous soft magnetic composites with nearly spherical particles and low coercivity can be effectively prepared using gas-water combined atomization process, showing superior magnetic properties compared to powders produced by gas atomization and water atomization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
Sun Haibo, Wang Ce, Zong Changbao, Wang Jinghui
Summary: The regulation mechanism of comprehensive soft magnetic properties was investigated in Fe-based amorphous powder cores with different granularity match schemes. The study found that the particle size matching has a significant impact on the magnetic properties of powder cores, with increased density leading to higher real part of complex permeability and reduced core loss, hysteresis loss, residual loss, and DC-bias property.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Y. T. Shi, W. Y. Lu, W. H. Sun, S. D. Zhang, B. J. Yang, J. Q. Wang
Summary: The pressure-dependent microstructure evolution of gas-atomized Fe-based amorphous alloy powders was investigated experimentally and theoretically. The results showed that the amorphous fraction and nucleation mode of particles were sensitive to the gas pressure. Additionally, the amorphous phase underwent three stages of reactions during devitrification.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Yutong Shi, Weiyan Lu, Wenhai Sun, Suode Zhang, Baijun Yang, Jianqiang Wang
Summary: This study investigates the influence of high gas pressure on powder particle characteristics in gas atomization by using numerical models. The dynamics of the gas phase flow and gas-melt two-phase flow fields are explored, and the flow field of a discrete-jet closed-coupled gas atomization nozzle is analyzed. The results show that increasing gas pressure can gradually decrease the particle size and lead to a more concentrated distribution.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Pu Wang, Jiaqi Liu, Yannan Dong, Huan Zhao, Jing Pang, Jiaquan Zhang
Summary: A two-way coupling Discrete Phase Model (DPM) is used to analyze the secondary atomization process and study the particle flight and cooling processes under different process parameters. The results show that the average particle size depends on the gas-liquid interaction and decreases with increasing gas-to-melt ratio. The standard deviation of particle size increases with melt mass flow rate and both high and low atomization pressures result in higher standard deviation. The average cooling rate of particles can be improved by reducing the melt mass flow rate and increasing the atomization pressure. Furthermore, increasing the gas temperature can significantly reduce particle size and increase the average cooling rate, but excessive gas temperature leads to higher standard deviation and defective particles. Powders produced at 2.0 MPa and 0.075 kg center dot s(-1) exhibit good circularity and high amorphous fraction.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Ceramics
Zhong Li, Zhuangzhuang Li, Xingyu Liu, Shuyan Shi, Hongxia Li, Xianguo Liu
Summary: Core/shell structured FeSiAl/MoO3 soft magnetic composites were fabricated using a two-step heat treatment process. The effects of ammonium molybdate (AHM) content and annealing temperature on the properties of the composites were investigated. The results showed that the electrical resistivity and mechanical properties of the composites can be regulated by controlling the AHM content. The optimal content of 15 wt% AHM resulted in the highest crushing strength and lowest core loss.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Haichen Yu, Guangqiang Zhang, Lingbing Meng, Xiantao Li, Zongzhen Li, Bangshao Dong, Shaoxiong Zhou
Summary: Fe83SixByC(17-x-y) has good glass forming ability (GFA) and high saturation magnetic induction (Bs). Spherical amorphous powder can be prepared using a gas-water coupling atomization (GWC) device. The Fe83Si2.5B11.5C3 amorphous powder exhibits the best comprehensive performance.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jiaqi Liu, Pu Wang, Yannan Dong, Huan Zhao, Jing Pang, Jiaquan Zhang
Summary: In this study, the primary atomization process is simulated using the Volume of Fluid (VOF) model and dynamic adaptive mesh method. The effects of melt mass flow rate, atomization pressure, and gas temperature on the breakup process are investigated. The gas-to-melt ratio (GMR) is proposed as a criterion for predicting the primary atomization breakup modes.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Metallurgy & Metallurgical Engineering
Jia-qi Liu, Yan-nan Dong, Pu Wang, Huan Zhao, Jing Pang, Xiao-yu Li, Jia-quan Zhang
Summary: This study investigates the effects of atomization gas pressure and assisted gas nozzles on atomization efficiency and powder characteristics. The results show that adjusting the atomization pressure and using assisted gas nozzles can improve powder quality and yield.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Haichen Yu, Guangqiang Zhang, Lingbing Meng, Xiantao Li, Zongzhen Li, Bangshao Dong, Shaoxiong Zhou
Summary: Amorphous powders of Fe(81-x-y)Si9B10CxCry (x = 0, 2, and y = 0, 2, at.%) with high sphericity were prepared using a gas-water coupled rapid-setting sedimentation atomization (GWC) device. The morphology and internal structure of the Fe(81-x-y)Si9B10CxCry amorphous powder were analyzed. The results showed that the composition and particle size of the alloy significantly affected the sphericity and glass forming ability (GFA) of the powders.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Engineering, Electrical & Electronic
Xu Zhu, Wei Liu, Jinyun Ju, Pengpeng Xu, Mengran Li, Xuebin Zhang, Jinzhi Wang, Zhongqiu Zou, Hailin Su
Summary: Fe-5.5wt%Si soft magnetic composites with excellent magnetic properties at low frequency were prepared using hot compaction combined with H3PO4 passivation. The effects of H3PO4 dosage and hot compaction on the microstructures and magnetic properties of the composites were investigated. The results showed that hot compaction can effectively reduce air gaps and improve density and maximum permeability. Decreasing H3PO4 dosage increased density and maximum permeability, resulting in improved hysteresis loss but deteriorated eddy current loss.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Liang Yan, Biao Yan, Yin Jian
Summary: In this study, mechanical ball milling was used to coat SiO2 nanopowder on a Fe-Si-B amorphous powder, resulting in the formation of Fe-Si-B/SiO2 core-shell amorphous composite powder. Discharge plasma sintering was then employed to create a magnetic powder core, and the phase composition and magnetic characteristics of the core were investigated.
Article
Materials Science, Multidisciplinary
Naoki Ito, Hajime Itagaki, Motoki Ohta
Summary: This study investigates the reduction of core loss in an Fe-based amorphous ribbon for distribution transformer cores through laser scribe. The effectiveness of core loss reduction by laser scribe is compared with that by fish scale-formation during ribbon casting. The research finds that laser scribe is more effective in reducing core loss than fish scale, with a significant reduction observed in a tested 53 kg single phase core.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)